DE102015010877A1 - Transporter of a resectoscope, pivot bearing and spring unit with pivot bearing - Google Patents

Abstract

The invention relates to a transporter (10) of a resectoscope for endoscopic surgery comprising a shaft tube (12) for receiving an optical unit (14), a carriage (16) mounted longitudinally displaceably on the shaft tube (12) for actuating a carriage (16) which can be coupled to the carriage (16) Working instrument (18) and with a handle unit, comprising a first, with the shaft tube (12) coupled to the movement of the feed dog (20) and a second, with the carriage (16) coupled to the movement of the feed dog (10) (22), wherein the handle parts (20, 22) from a rest position against a, provided by a spring unit (24) spring force can be actuated into a pressure position, and wherein the spring unit (24) arranged in a housing (26) spring element ( 36), wherein the housing (26) comprises two relatively rotatable housing parts (38, 40).

Description

The invention relates to a transporter of a resectoscope for endoscopic surgery according to the preamble of claim 1, a pivot bearing for a spring unit of a medical instrument according to the preamble of claim 12 and a spring unit with a pivot bearing according to the invention.

An essential component of a medical resectoscope is the so-called transporter. The feed dog is typically equipped with a carriage which slides on a tube and is spring-loaded in a rest position by means of a spring unit. For the mechanical movement of a surgical working instrument which can be coupled to the resectoscope, the resectoscope is equipped with a handle unit which can be actuated by the surgeon's hand movement. The operation of the handle unit usually leads to a longitudinal displacement of the working at the distal end of the resectoscope working instrument. For connection to the resectoscope, the working instrument has an elongated tool shank, which can be fastened to the carriage for producing a motion-coupled connection at its proximal end.

The carriage of a generic transporter has at least one contact point via which the working instrument connected to the transporter can be acted upon by high-frequency current. Transporters of this type can be designed for use on monopolar or bipolar resectoscopes. In conventional monopolar resectoscopes, a first pole of a high-frequency source is conducted to the working instrument via a supply cable connected to the transporter or to the resectoscope. The high-frequency current is conducted to the tissue to be treated via an electrode (active electrode), which is typically arranged at the distal end of the working instrument. In monopolar instruments, the high frequency current typically flows from the active electrode across the patient's body to a second electrode (neutral electrode) attached to the patient's body which is also connected via a connecting cable to the second pole of the radio frequency source.

In bipolar resectoscopes, both poles of the high-frequency source are connected to the resectoscope or to the feed dog. In addition to the active electrode, a neutral electrode is provided on the bipolar resectoscope, which receives the current after the introduction into the tissue to be treated and dissipates via a return line to the high frequency source. For example, the neutral electrode on a bipolar resectoscope may be an additional electrode that is forcibly moved with the active electrode. Also, parts of the resectoscope, such as the shaft of the transporter or a coaxially arranged outer shaft, can be used as a neutral electrode.

From the prior art different ways are known to direct a high-frequency current to an active electrode. Usually, a first contact point is provided on the carriage, to which a high-frequency current leading connection cable can be connected. In a coupled to the carriage working the contact point is conductively connected to the working instrument or with the active electrode carried on the working electrode. A second contact point, which is electrically conductively connected to the shaft of the transporter or to the neutral electrode of the resectoscope, is frequently provided on a proximal end body of the transporter. In this construction, the first and the second contact point are arranged on mutually movable components.

For the further development of a known transporter is desired to accommodate the first and the second contact point on a common component, for example on the carriage or on the end body also known as optical guide plate in the proximal end of the conveyor. Since the working instrument is typically electrically contacted on the carriage and the neutral electrode is typically electrically contacted on the optics guide plate, either the high frequency current for the active electrode or the return current of the neutral electrode must be transferred between two mutually movable parts.

The transmission of a high-frequency current between two mutually movable parts often causes problems because it comes to sparking between these parts in the area of contact surfaces. On the one hand, this sparking leads to the combustion or microwelding on the surfaces of the mutually moving parts and thus to the damage of the instrument, and furthermore high-frequency electromagnetic fields are generated which can interfere with instruments located nearby.

It is known from the prior art to use sliding or rolling bearings with electrically conductive bearing grease to conduct electricity between components that are movable relative to one another. It is also known to use abrasive elements, such as carbon brushes or graphite contacts. Another possibility is to electrically connect the mutually movable parts with a flexible cable.

For use on a resectoscope, the known variants of power transmission are unsuitable. Requirements for biocompatibility and cleanability of the components of a resectoscope limit the use of supplies, such as a conductive grease. Slip rings, carbon brushes and other abrasive elements are very abrasive and leave residues due to abrasion. These known options require frequent and intensive maintenance and are error-prone. In addition, an intensive and time-consuming cleaning is necessary to eliminate abrasion.

The use of cables to connect the moving parts is problematic because both the choice of materials is very limited, and the reliability of the instrument over a long period of time and many preparation cycles with some manual operations, such as brushing, in question ,

The invention has for its object to provide an improved feed dog, a suitable pivot bearing and a spring unit, which improve the flow control between two relatively movable components.

The object is achieved by a conveyor with the features of claim 1, a pivot bearing with the features of claim 12 and a spring unit with the features of claim 14. Advantageous embodiments are specified in the dependent claims.

According to the invention, a transporter of a resectoscope for endoscopic surgery is provided with a shaft tube for accommodating an optical unit, a carriage longitudinally displaceably mounted on the shaft tube for actuating a working instrument which can be coupled to the carriage and having a handle unit comprising a first grip part coupled in movement to the shaft tube on the conveyor and a second, with the carriage motion-coupled to the conveyor arranged gripping part, wherein the handle parts from a rest position against a, provided by a spring unit spring force can be actuated into a pressure position, and wherein the spring unit comprises a housing disposed in a spring element, wherein the housing comprises two relatively rotatable housing parts arranged.

When using a housing enclosing the spring element, the spring element is protected against unintentional contact with the surgeon or the patient. The spring element is thus also effectively protected from contact with nucleating and corrosive substances such as body fluids or the like.

The housing with the spring element mounted therein forms a pivot bearing, which can serve on the one hand to provide a spring force and, with appropriate storage of mutually rotatable components, on the other hand for producing a rotation between the end body and the carriage of the transport. It is envisaged that the housing parts are rotatably mounted about a common axis of rotation.

The transporter can be designed as an active or as a passive instrument. In an active instrument, the distal end of the working instrument is axially moved in the rest position in the distal direction and is movable with the actuation of the handle parts in the pressure position in the proximal direction. In a passively executed instrument, this movement is reversed. In the rest position, the distal end of the working instrument is in a first starting position and is axially displaced by actuation of the handle unit in the printing position to a distal position. The spring unit can be designed either for an active or for a passive instrument.

Design details of the spring unit can in particular according to the in DE 101 26 542 A1 be described spring bridge formed. This document of the applicant is expressly referred to in terms of possible designs and construction details of the spring unit.

To protect against unwanted damage to the spring element by excessive rotation of the housing parts to each other is thought that the housing parts are rotatable in a limited angular range to each other. Basically, the angle range is freely selectable and limited by mechanical stops. Conceivable is a limitation in particular to one of the angular ranges 180 °, 135 °, 90 °, 45 ° or less than 45 °.

In a preferred embodiment, it is contemplated that the housing parts are each tubular and wherein at least one of the housing parts is slidably mounted with its inner surface on the outer surface of a tubular slider.

Together with the sliding body, the housing forms a sliding bearing. It is conceivable that only one of the housing parts slidably supports on the slider. It can be provided that the slider is firmly connected to one of the housing parts. In the design of the pivot bearing is particularly thought that the housing and the slider are arranged coaxially with each other.

It is preferably provided that the sliding body extends at least partially around the spring element. The sliding body thus at least partially prevents the contact of the spring element with the inner surfaces of the housing parts. The sliding body may in particular be tubular or sleeve-like, wherein the spring element is preferably arranged coaxially in the tubular sliding body.

For mechanically limiting the angle of rotation between the housing parts, it is envisaged that the housing parts each have a first stop, wherein the stops come into mutual contact upon reaching a first rotational position of the housing parts. Furthermore, it is envisaged that the housing parts each have a second stop, wherein the stops come into mutual contact upon reaching a second rotational position of the housing parts.

When such mechanical stops are used, a first end stop is provided when a first rotational end position is reached in a first rotational direction or a second end stop when a second rotational end position is reached in a second rotational direction. The permitted rotation range of the housing parts lies between the two rotational end positions.

Incidentally, it can be provided that the rest position of the pivot bearing, so the rotational position in which forces the spring element after rotation of the housing parts, is located between the rotational end positions. In a rest position between the rotational end positions, the spring element is in a neutral position in which it generates no spring force-based torque between the housing parts. Alternatively, the rest position of the pivot bearing is provided in the contact position of the first or second stops.

For a particularly smooth sliding bearing between the housing parts and the slider is thought that the slider is at least partially made of a plastic or at least partially coated with a plastic layer, wherein the plastic is preferably polytetrafluoroethylene (PTFE).

For a current flow between the mutually rotatable housing parts is provided that at least one of the housing parts is made of a metal, in particular of a stainless steel. Alternatively or additionally, it can be provided that at least one of the housing parts has a contact point which is connected in an electrically conductive manner to the spring element for making electrical contact with a component of the transporter or a resectoscope equipped with the transporter.

For the design of the spring element and its arrangement in the housing forming the rotary bearing is thought that the spring element is formed as a torsion spring with two about a spring axis against each other rotatable ends, wherein a first end of the spring element on a first housing part and a second end of the spring element is attached to a second housing part. It is particularly thought that the spring element is secured to the housing parts, so that a rotation of the housing parts to one another causes a rotation of the torsion spring about its spring axis. The spring element is connected to the housing parts in each case material, force and / or positive fit.

For a current flow between the housing parts is further thought that the housing parts and the spring element are at least partially made of electrically conductive material, and wherein the spring element is contacted with the housing parts such that produced by means of the spring element, an electrically conductive connection between the housing parts is. It is preferably provided that the spring element is integrally connected to the housing parts. In particular, it is thought that the spring element is soldered or welded to the housing parts. For the passage of electrical signals or a high-frequency forward or reverse current, the spring element is electrically conductive. Preferably, the spring element is made of a metal.

When using a current-carrying spring element sparking between mutually sliding surfaces of the housing parts are prevented. Thus, microwelding or surface damage to the mutually moved surfaces of the housing parts does not occur and there is no risk of generation of interfering electromagnetic fields.

As a spring element different types of springs can be used, which can serve as a torsion spring. In possible variants, it is envisaged that the spring element is designed as a helical spring or torsion bar spring. A helical spring offers the advantage that a relatively long rotation or low restoring forces are achieved on a short length measure. It has been found that coil springs, in particular helical springs designed as leg springs, provide a force-displacement ratio which is particularly favorable for carrying out operations.

According to the invention is also a pivot bearing for a spring unit of a medical instrument with a, two relatively rotatable housing parts comprehensive housing, wherein the housing parts are held by a spring element spring-biased in a first rotational position. Advantages and possible design features can be found in the embodiments relating to the inventive carrier for the pivot bearing.

According to the invention is also a spring unit for a medical instrument with a previously described pivot bearing.

Embodiments of the invention are shown schematically in the figures. Show it:

1 a schematic illustration of a conveyor according to the invention,

2 a side view of a pivot bearing according to the invention,

3 a sectional view of the pivot bearing 2 along the section 3-3, and

4 a sectional view of the pivot bearing 2 along the section 4-4.

1 shows in a simplified schematic representation of a conveyor 10 with an elongated shaft tube 12 , The shaft tube 12 Also known as an optic guide tube, it opens proximally in a passage of an end body 34 , The end body 34 typically has a plate-shaped configuration oriented transversely to the shaft direction and is commonly referred to as an optical guide plate.

From the proximal direction is a straight optic tube of an optical unit 14 in the passage of the end body 34 and further into the shaft tube 12 plugged in. The optics tube of the optical unit 14 passes through the shaft tube 12 of the transporter 10 completely, so that the distal end of the optical unit 14 the distal end of the shaft tube 12 surmounted. The distal end of the optical tube is present obliquely, so that an angled viewing direction to an oblique to the longitudinal axis of the shaft tube 12 in front of the distal end of the conveyor 10 lying area is possible.

The end body 34 is in the longitudinal direction of the shaft tube 12 immovable and preferably rotationally fixed to the shaft tube 12 arranged. About a spring unit 24 is the end body 34 with a longitudinally displaceable on the shaft tube 12 stored sled 16 connected. The spring unit 24 holds the sled 16 in relation to the end body 34 preferably spring-biased in a rest position.

In the present embodiment, the feed dog 10 exemplary with a working tool 18 fitted. The working tool 18 is with an elongated tool shank in a on the shaft tube 12 attached guide tube 32 plugged in. The guide tube 32 is usually cohesively on the shaft tube 12 attached. Usually the guide tube becomes 32 with the shaft tube 12 soldered or welded. The tool shank of the working tool 18 is in the guide tube 32 mounted longitudinally displaceable. In the distal end region is a stabilizing tube 30 on the tool shank of the working instrument 18 attached. The stabilization tube 30 is on the optics tube of the optics unit 14 guided longitudinally displaceable and serves to stabilize the at the distal end of the working instrument 18 arranged working electrode 19 ,

In its proximal end area is the working tool 18 motion coupled to the carriage 16 fixable. In the longitudinal displacement of the carriage 16 on the shaft tube 12 becomes the working tool 18 forcibly moved. This becomes the distal end of the working instrument 18 in the axial direction of the conveyor 10 postponed.

A transporter 10 and a working tool 18 are the basic elements of a resectoscope. To provide a smooth outer wall for easy insertion into a patient's body and for safe maneuvering in narrow body canals of a patient becomes the transporter 10 with the working tool 18 with the distal end inserted into a resection stem (not shown). The resection shaft is in its proximal end region at a fixed to the shaft tube 12 attached locking body 13 connected. The locking body 13 is also known as a cone body or locking cone. In the passage of the Resektionsschaftes (not shown) further working channels, for example, for the supply and / or discharge of rinsing liquids can be provided.

The optical unit serves to observe the area of operation 14 , At the proximal end of the optical unit 14 an eyepiece for direct observation by the surgeon and / or for connection of an image processing device is provided.

In the present case is the transporter 10 trained as an active instrument. That is, the distal end of the working instrument 18 is in the resting position of the sled 16 held axially displaced in a distal position in a starting position. to Active implementation of an operation step is the working tool 18 against that of the spring unit 24 applied spring force by means of manual actuation of a handle unit forcibly guided in the proximal direction into an actuating position movable. The working tool 18 leading sledges 16 is moved from the rest position against the spring force in a printing position. A passive instrument is the working tool 18 axially retracted in the starting position and is moved by manual operation of the handle unit against the spring force proximally in the operating position.

The grip unit comprises a first grip part designed here as a thumb ring 20 and a, in the present case designed as a finger attachment second handle part 22 , The first handle part 20 is opposite the shaft tube 12 axially immovable to the transporter 10 arranged. In particular, as shown, it can be provided that the first grip part 20 on the end body, also referred to as an optics guide plate 34 is stored. The second handle part 22 is with the sled 16 motion coupled to the conveyor 10 arranged. Upon actuation of the handle unit become the handle parts 20 and 22 relative to each other against that of the spring unit 24 provided spring force moves. This is the sled 16 on the shaft tube 12 displaced longitudinally.

The spring unit 24 in the present case consists essentially of two spring legs 28 , wherein a first leg 28 rotatably mounted on the end body in its foot area 34 is articulated. The second leg 28 is rotatably mounted on the carriage in his foot area 16 hinged. In their head areas are the spring legs 28 on a pivot bearing according to the invention with housing 26 attached. Additionally or alternatively it can be provided that the legs 28 the spring unit 24 in their foot areas in each case via an inventive pivot bearing with housing 26 on the end body 34 or the carriage 14 rotatably mounted. In each case, a first housing part on a leg 28 and a second housing part on the end body 34 or the carriage 16 be arranged rotatably.

Basically, it is conceivable that the spring force of the spring unit 24 - As with conventional spring bridge constructions - alone or essentially by a in their head area between the legs 28 arranged spring element is provided. The spring element generates restoring forces between the legs 28 after a rotation of the thighs 28 around a common axis of rotation. Alternatively or additionally, spring forces of the spring unit 24 through in the foot area of the thighs 28 arranged spring elements are provided, in which case the restoring forces between each leg 28 and the end body 34 or the carriage 16 be generated.

As explained in more detail below, in the rotary bearing housing according to the invention 26 arranged a spring element which generates a restoring force between two rotatably mounted housing parts. It is conceivable that the spring force of the spring unit 24 solely by one or more spring-loaded rotary bearing housings 26 provided. This can be done in the head area of the thighs 28 and / or in the foot areas of the thighs 28 Be provided pivot bearing according to the invention. Also conceivable is a combination with conventional techniques, wherein in the head region of the spring legs 28 a, for example, designed as a helical spring leg spring may be arranged and additional restoring force by at least one in the foot region of the legs 28 arranged inventive pivot bearing is provided.

The spring element used in the head area can, for example, as in the applications DE 10 2015 003 046.9 or DE 10 2015 003 045.0 be educated. These documents of the applicant are expressly referred to in terms of possible designs and construction details of the spring unit and in particular of the usable spring element in the head area.

2 shows a schematic side view of a pivot bearing according to the invention transversely to its axis of rotation. The housing 26 The pivot bearing consists of two housing parts 38 . 40 , Which are rotatably mounted about a common axis of rotation to each other. The housing parts 38 and 40 each have first stops 44 . 46 on, preferably as integral with the housing parts 38 . 40 executed projections 58 . 60 are formed. To reach a stop position are the housing parts 38 . 40 arranged such that the projections 58 . 50 each in a corresponding recess of the respective other housing part 38 . 40 to grab. The attacks 44 and 46 form an end stop, which is the rotation of the housing parts 38 . 40 to limit the common axis of rotation in a first direction of rotation.

For use on the spring unit 24 of the transporter 10 can the housing parts 38 . 40 each on a leg 28 be fixed rigidly or rotationally fixed. As explained is conceivable, the pivot bearing with the housing 26 between the thighs 28 and / or between each leg 28 and the end body 34 or the carriage 16 to arrange. The thigh 28 or the parts of the carrier 10 can in particular on the opposite in the axial direction of the pivot bearing end face outer surfaces of the housing parts 38 . 40 be attached. For example, screw threads can be arranged on the outer surfaces for this purpose. Screwing elements can thus be screwed to the outer surface of the housing parts, without that in the casing 26 arranged spring element 36 to damage. Also, the pressing of the housing or the housing parts in the legs 28 or in the articulation points on the end body 34 or on the sledge 16 is conceivable.

3 shows the pivot bearing with the housing 26 out 2 in a sectional view along the section line 3-3. 4 shows a section of the pivot bearing 2 along the section 4-4. How vividly in the 3 and 4 shown, is a spring element 36 inside the case 26 arranged. The spring element 36 is designed as a torsion spring, in the present case in the form of a helical spring. It is also conceivable without further notice that the spring element 36 is designed as a straight wire, as a torsion bar or in any other suitable for a torsion suspension shape.

In particular, when using a trained as a straight wire spring element, the use of a geometrically complex or expensive spring element can be avoided. Depending on the material and / or strength of the wire, the spring element can develop torsionally different restoring forces. A straight wire is particularly suitable if only low restoring forces are to be generated.

The spring element 36 is at its opposite ends 52 . 54 in each case firmly with the housing parts 38 . 40 connected. During the rotation of the housing parts 38 and 40 about the common axis of rotation against that of the spring element 36 applied spring force, a restoring force is generated, which the housing parts 38 . 40 forces back into a starting position or rest position.

Preferably, the ends are 52 . 54 of the spring element 36 each with one of the housing parts 38 . 40 welded or soldered. Alternatively or additionally, it may be provided that the ends 52 . 54 each with the housing parts 38 . 40 are connected positively and / or non-positively.

When used in a spring unit 24 a transporter 10 a resectoscope, as in 1 exemplified, can by the with the spring element 36 equipped pivot bearing a restoring force are generated, which the carriage 16 opposite the end body 34 forces from a printing position to a rest position.

As in the 3 and 4 further shown is the spring element 36 from a sleeve-like or tubular slider 42 edged. The spring element 36 is coaxial in the tubular sliding body 42 arranged. The slider lies with its circular cylindrical outer surface on the circular cylindrical inner surface of at least one of the housing parts 38 . 40 , At least one of the housing parts 38 . 40 guided at the rotational rotation to each other with its inner surface on the outer surface of the slider 42 , It is thought that the friction coefficient for static friction between the sliding partners, ie between at least one of the housing parts 38 . 40 and the slider 42 is less than 0.2 and preferably less than 0.1. For the sliding friction is thought that between the sliding partners mentioned a friction coefficient of less than 0.1 and preferably less than 0.05 prevails. Preferably, the difference between the coefficient of adhesion and the sliding friction coefficient is so small that no or only little stick-slip effects occur between the sliding partners.

Preferably, the sliding on the sliding body housing part is made of a stainless steel. In particular, it is thought that both housing parts 38 and 40 are made of a stainless steel. To provide particularly good sliding properties between the sliding partners, it is provided that the sliding body 42 is made of a plastic, in particular polytetrafluoroethylene (PTFE). It may alternatively or additionally be provided that the sliding body is coated on its outer surface at least partially with a plastic layer, wherein the plastic is preferably polytetrafluoroethylene.

For producing an electrically conductive connection between the first housing part 38 and the second housing part 40 is provided that the ends 42 . 54 of the spring element 36 electrically conductive to the respective housing parts 38 . 40 are attached. For passing an electrical signal or an electrical current from the first housing part 38 to the second housing part 40 is the spring element 36 made of an electrically conductive material. Conceivable is a conventionally used spring steel.

When using an electrically conductive spring element 36 can the spring unit 24 easy as a current path between the end body 34 and the sled 16 be used. For example, for a designed as a spring bridge with legs spring unit 24 be provided in the foot areas of the legs respectively pivot bearing according to the invention, which is a current guide between the end body 34 or the carriage 16 and ensure the respective leg. In the head region of the spring bridge can be made between the legs an electrically conductive connection via a conventional, electrically conductive spring element or also via an inventive pivot bearing.

In 4 is with reference numerals 56 characterized a gap between the first housing part 38 and the second housing part 40 intended can be. For system-free rotation of the housing parts 38 . 40 to each other, the ease of rotation of the pivot bearing is improved. A direct contact between the components is when using an electrically conductive spring element 36 not necessary to draw a current from the first housing part 38 to the second housing part 40 to convict. Is the gap of the gap 56 , chosen so that at the electrical potential used sparkover between the housing parts 38 . 40 are prevented and are the first and second stops between the housing parts 38 . 40 so electrically isolated that when in contact no electrical connection between the housing parts 38 . 40 is made, it can be ensured that the current conduction between the housing parts 38 . 40 exclusively via the spring element 36 is directed.

As shown, the housing parts 38 . 40 be approximately cup-shaped, wherein in any case a circular cylindrical wall of the housing parts 38 . 40 closed in the axial direction at a first end face and open at the opposite second end face. The housing parts 38 . 40 are with their opening on the sleeve-like slider 42 attached and close the passage openings of the slider 42 with their closed bottom areas, so that in the housing 26 arranged spring element 36 is protected from contamination and accidental contact with an operator of the instrument or the patient.

When using the illustrated pivot bearing on a spring unit 24 with thighs 28 can the thighs 28 each on one of the housing parts 38 . 40 be attached. By means of an electrically conductive connection of the legs 28 on the housing parts 38 . 40 is simply a current guide of a first leg 28 to a second leg 28 and thus of the end body 34 to the sled 16 allows. It is avoided to pass an electrical signal or a high frequency current over two sliding surfaces.

The outer surface of the housing parts 38 . 40 is geometrically freely selectable and thus free of the used construction of the spring unit 24 customizable. In the present case are the housing parts 38 . 40 shown formed with a circular cylindrical outer surface. Without further, flange elements (not shown) on the housing parts 38 . 40 conceivable for attachment to parts of the spring unit 24 serve.

Out 3 it can be seen that on the housing parts 38 . 40 further second attacks 48 . 50 may be provided, which is analogous to the first attacks 44 . 46 integral with the housing parts 38 . 40 executed projections can be formed. The second stops 48 . 50 serve to limit the angle of rotation in a second direction of rotation.

LIST OF REFERENCE NUMBERS

10

carrier

12

steerer

13

cone body

14

optical unit

16

carriage

18

working tool

19

Stabilizing tube of the working tool

20

first handle part

22

second handle part

24

spring unit

26

Housing with spring element

28

leg

30

stabilization tube

32

guide tube

34

end body

36

spring element

38

first housing part

40

second housing part

42

sliding

44

first stop of the first housing part

46

first stop of the second housing part

48

second stop of the first housing part

50

second stop of the second housing part

52

first end of the spring element

54

second end of the spring element

56

gap

58

Projection with stop of the first housing part

60

Projection with stop of the first housing part

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10126542 A1 [0017]
• DE 102015003046 [0050]
• DE 102015003045 [0050]

Claims (14)

Carrier ( 10 ) of a resectoscope for endoscopic surgery with a shaft tube ( 12 ) for receiving an optical unit ( 14 ), one on the shaft tube ( 12 ) longitudinally displaceably mounted carriage ( 16 ) for actuating one with the carriage ( 16 ) coupled working tool ( 18 ) and with a handle unit, comprising a first, with the shaft tube ( 12 ) coupled in motion to the conveyor ( 10 ) arranged handle part ( 20 ) and a second, with the carriage ( 16 ) coupled in motion to the conveyor ( 10 ) arranged handle part ( 22 ), wherein the handle parts ( 20 . 22 ) from a rest position against one, by means of a spring unit ( 24 ) spring force can be actuated in a pressure position, characterized in that the spring unit ( 24 ) in a housing ( 26 ) arranged spring element ( 36 ), wherein the housing ( 26 ) two relatively rotatable housing parts ( 38 . 40 ). Transporter according to claim 1, characterized in that the housing parts ( 38 . 40 ) are rotationally rotatable relative to each other in a limited angular range. Feed dog according to one of claims 1 or 2, characterized in that the housing parts ( 38 . 40 ) each tubular and wherein at least one of the housing parts ( 38 . 40 ) with its inner surface on the outer surface of a tubular slider ( 42 ) is slidably mounted. Transporter according to one of the preceding claims, characterized in that the sliding body ( 42 ) at least partially around the spring element ( 36 ) extends around. Transporter according to one of the preceding claims, characterized in that the housing parts ( 38 . 40 ) each have a first stop ( 44 . 46 ), the stops ( 44 . 46 ) upon reaching a first rotational position of the housing parts ( 38 . 40 ) come into mutual contact with each other. Transporter according to one of the preceding claims, characterized in that the housing parts ( 38 . 40 ) each have a second stop ( 48 . 50 ), the stops ( 48 . 50 ) upon reaching a second rotational position of the housing parts ( 38 . 40 ) come into mutual contact with each other. Transporter according to one of the preceding claims, characterized in that the sliding body is at least partially made of a plastic or at least partially coated with a plastic layer, wherein the plastic is preferably polytetrafluoroethylene. Transporter according to one of the preceding claims, characterized in that at least one of the housing parts ( 38 . 40 ) is made of a metal, in particular of a stainless steel. Transporter according to one of the preceding claims, characterized in that the spring element ( 36 ) as a torsion spring with two about a spring axis against each other rotatable ends ( 52 . 54 ), wherein a first end ( 52 ) of the spring element ( 36 ) on a first housing part ( 38 ) and a second end ( 54 ) of the spring element ( 36 ) on a second housing part ( 40 ) is attached. Transporter according to one of the preceding claims, characterized in that the housing parts ( 38 . 40 ) and the spring element ( 36 ) are at least partially made of electrically conductive material, and wherein the spring element ( 36 ) in such a way with the housing parts ( 38 . 40 ) is contacted, that by means of the spring element ( 36 ) an electrically conductive connection between the housing parts ( 38 . 40 ) is made. Transporter according to one of the preceding claims, characterized in that the spring element ( 36 ) Is designed as a helical spring or a torsion bar. Rotary bearing for a spring unit ( 24 ) of a medical instrument ( 10 ) with one, two relatively rotatably arranged housing parts ( 38 . 40 ) comprehensive housing ( 26 ), wherein the housing parts ( 38 . 40 ) by means of a spring element ( 36 ) are held spring biased in a first rotational position. Rotary bearing according to claim 5 having the features of one of claims 2 to 11. Spring unit for a medical instrument with a pivot bearing according to one of claims 12 or 13.

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